Study carerully Specimens H, J, Kand L and use them to answer the following question:
(a) Make a drawing 8-10cm long of the longitudinal section of specimen H and label fully.
(ii) What type of fruit is specimen H?
(ii) State two other examples of the type of fruit to wnich specimen H belongs.
(iv) Is specimen H a true fruit or a false fruit?
(v) Give one reason for your answer in a(iv) above.
(vi) State the food classes present in specimen H.
(b)(i) State one(1) feature common to specimens J, K and L.
(ii) State two observable characteristic features each of specimens J, K and L.
(iii) State the mode of vegetative propagation of specimens K and L.
(C) State the biological significance of specimens K.
observe specimen C carefully and answer the following questions.
(a)(i) State tne class to which specimen C belongs.
(ii) Give three reasons for placing Specimen C in that class.
(iii)State two food items which specimen C feeds on.
(b) State two observation of each of specimen C which adapt it to: (i) its mode of feeding (ii) locomotion
(c) List three observable characters of specimen C which can be inherited.
(ii) If white feather colour (W) Is dominant in chickens over black feather colour (w),
with the aid of qenetic.diagrams show how it can be determined whether specimen C is homozygous dominant or heterozygous dominant.
(a)(i) Specimen A is a flower. Remove all the stamens and three petals from specimen A leaving the special petal.
Make a drawing 10-12cm long of the remaining parts of specimen A and label fully.
(ii) what type of ovary is present in specimen A?
(ii) Give one reason for your answer in 1(a) (i) above.
(iv) Describe the petals and sepals of specimen A.
(v) What is the function of the special petal?
(vi) State three features of specimen A which have led to the success of flowering plants.
(b)(i) What type of fruit is specimen B?
(ii) Give two other examples of the fruit type.
(iil) State the mode of dispersal of specimen B.
(iv) State two biological importance of the class of fruit to which specimen B belongs.
(a) Explain the following modes of nutrition which occur in plants:
(i)Autotrophic
(ii) Chemosynthetic
(iii) Carnivorous
(b) Give one example each of a plant which undergoes the modes of nutrition listed in (a) above.
(c) (i) Describe three ways by which nitrogen is added to the soil for plant use.
(ii) State two ways by which nitrogen is lost from the soil.
(a) What are hormones?
(b) In a tabular form, state four differences between nervous coordination and hormonal coordination in humans.
(c) State three effects each of: (i) Over-secretion (ii) Under-secretion of thyroxin on mammals.
(d) Make a diagram 10 – 12cm long of the reflex arc and label fully.
(a) Describe the main stages of mitotic division.
(b) State four ways in which mitosis is important to living organisms.
(a) Explain the following terms:
(i) Population
(ii) Competition
(iii) Succession
(b)(i) State three sources of noise pollution.
(ii) List two ways by which noise pollution can be reduced.
(c) State three effects each of the following pollutants on humans: (i) smoke (ii) sewage
(a) What is transpiration?
(b)(i) Name two types of transpiration
(ii) List two factors which affect the rate of transpiration.
(c) Describe the mechanisms of opening and closing of the stomata.
(d) State:
(i) two similarities and (ii) two differences between transpiration and sweating.
(a) State one function of each of the following structures:
(i) Arteries
(ii) Capillaries
(iii) Veins
(iv) Xylem
(v) Phloem
(b) Describe the changes that take place in the composition of human blood as it passes through the:
(i) Lungs
(ii) Liver
(iii) Kidneys
(iv) Small intestine
(c) List the cellular components of blood.
The order of evolution trend in plants is
- A. Bryophyta, Thallophyta, Pteridoiphyta and Spermatophyta
- B. Thallophyta Bryophyta Pteridoiphyta and Spermatophyta
- C. Spermatophyta, pteridophyta, Bryophyta and Thallophyta
- D. Bryophyta, Pteridophyta, Spermatophyta and Thallophyta
The accepted concepts for the theory of Natural Selection does not include
- A. tendency for organisms to over produce
- B. struggle for existence
- C. survival of the fittest
- D. use and disuse of body parts
Which of the following occurrences cannot be taken as a direct observation of natural Selection in recent times?
- A. Industrial melanism in moths
- B. Selective breeding in cattle
- C. Insecticide resistance of some mosquitoes
- D. Development of long necks in giraffes
Which of the following statements is not true of the worker termite? They
- A. Build and repair nest
- B. produce enzymes to digest cellulose
- C. search for food to feed the colony
- D. look after the nymph
If red is dominant to white and homozygous red pea-plants are crossed with homozygous white pea-plants, the first filial generation will have
- A. red flowers, 2 white flowers
- B. 4 red flowers
- C. white flowers
- D. 4 pink flowers
The resemblance of a palatable insect to a poisonous insect is an example of
- A. a chemical deterrent to a predator
- B. an escape from the predator camouflage
- C. an escape from the predator by mimicry
- D. a defense against the predator by warming coloration
Which of the following diseases is commonly observed in human males and is sex-linked?
- A. Beriberi
- B. Down’s syndrome
- C. Sickle-cell anaemia
- D. colour blindness
What of the following occurrences is not a feature of meiosis?
- A. Formation of four haploid cells
- B. Two successive nuclear cell division
- C. Pairing of homologous chromosomes at prophase
- D. Formation of two diploid cell
What does the chemical composition of the genetic material of all living organisms consist of?
- A. Deoxyribonucleic acid
- B. Adenosine diphosphate
- C. Adenosine triphosphate
- D. follicle stimulating hormone,
The effective cells involved in sickle-cell anaemia disease are
- A. phagocytes
- B. lymphocytes
- C. erythrocytes
- D. thrombocytes
The sudden change in a gene structure or chromosome number in an organism likely to cause an inheritable change in the phenotype is known as
- A. migration
- B. mutation
- C. mitosis
- D. meiosis
The observable characteristics of an individual usually resulting from the interaction between the gene composition and the environment is referred to as
- A. allele
- B. genotype
- C. phenotype
- D. chromosome